Use user-supplied JsonConverters when deserializing IProgress<T> report

[AArnott]

Fixes #377 and adds tests (that fail before the fix is applied)

[codecov-io]

Codecov Report

Merging #382 into master will increase coverage by 0.72%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
+ Coverage   90.25%   90.97%   +0.72%     
==========================================
  Files          45       35      -10     
  Lines        3448     2439    -1009     
==========================================
- Hits         3112     2219     -893     
+ Misses        336      220     -116

Impacted Files	Coverage Δ
src/StreamJsonRpc/JsonMessageFormatter.cs	93.2% <100%> (+0.36%)	⬆️
src/StreamJsonRpc/Exceptions/LocalRpcException.cs	50% <0%> (-25%)	⬇️
...nRpc/Reflection/MessageFormatterProgressTracker.cs	92.98% <0%> (-2.18%)	⬇️
src/StreamJsonRpc/PipeMessageHandler.cs	89.39% <0%> (-1.97%)	⬇️
src/StreamJsonRpc/SkipClrVisibilityChecks.cs	92.04% <0%> (-1.14%)	⬇️
src/StreamJsonRpc/HeaderDelimitedMessageHandler.cs	86.22% <0%> (-0.17%)	⬇️
src/StreamJsonRpc/ProxyGeneration.cs	99.66% <0%> (-0.04%)	⬇️
...StreamJsonRpc/Reflection/JsonRpcMethodAttribute.cs	100% <0%> (ø)	⬆️
src/StreamJsonRpc/WebSocketMessageHandler.cs	100% <0%> (ø)	⬆️
src/StreamJsonRpc/LengthHeaderMessageHandler.cs	100% <0%> (ø)	⬆️
... and 23 more

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[milopezc]

Looks good